bobmcrae

Slow UDF Performance

5 posts in this topic

I have a very simple UDF, which contains a few "helper" functions, like the one below (_getNetworkDrive).  I notice that when I call this function from my main script, which is approaching 3000-lines of code (big & some what complex), the performance of the UDF function _getNetworkDrive is very slow as compared to when I call the same function from a simple test script.  I do not have any different processing happening (e.g., launching another script) between the BIG script and the small test script.  I also confirmed that the CPU & memory are nominal (not significantly different from the test script) when the BIG script is running the _getNetworkDrive function.

To quantify the performance hit, I ran several times with the test script and see that the function takes about 30-mSec, with a few peaks near 300-mSec.  The same function/UDF called from the BIG script takes anywhere from 1-second (on the low end) to as much as 16-seconds!  So, we're talking about 2-3 orders of magnitude difference.  The majority of processing time seems to be in the For/Next loop that is iterating through the drives.  I suspect that the culprit is the FileExists($drive) conditional check, but I cannot understand why that would be the case when called from a larger script.

Any ideas of why the UDF function's performance would suffer  when part of a larger script?

 

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Not sure what the last couple of line are, or should that be the UDF you are referring to?
I can't imagine why there would be a significant difference either between a large and small script using the same UDF.
Maybe you can insert some consolewrite statements showing the actual time it takes in the different scenario's.

Jos


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Can you at least post the _getNetworkDrive function (maybe it's the unreadable lines at the end of your post)?
Maybe your code runs into some kind of timeout when checking for a non existing network drive?


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How weird, I posted the code in the original posting using the <> (code) tool.  I'll try again here.

Jos, the times I was reporting were from a consolewrite of TimerInit & TimerDiff portions built into the function.  Hopefully, you can see that below.

Func _getNetworkDrive()
$t1 = TimerInit()
    ; Iterate through the network drives
    $driveDetails = '\\xxx.brickftp.com@SSL\DavWWWRoot'
    ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $driveDetails = ' & $driveDetails & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
    $drives = DriveGetDrive('Network')
    If UBound($drives)>=2 Then
        For $i=1 To $drives[0]
            $drive = $drives[$i]
            ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $drive = ' & $drive & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
            If StringInStr(DriveMapGet($drive), $driveDetails) And FileExists($drive) Then
                ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TimerDiff($t1) = ' & TimerDiff($t1) & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
                Return $drive
            EndIf
        Next
    EndIf

    ; No drive found, attempt to map
    $drive = DriveMapAdd('*', $driveDetails, 1,  $sftpCpUser, $sftpCpPass)
    ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : TimerDiff($t1) = ' & TimerDiff($t1) & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
    If Not $drive Then Return SetError(-1, 0, 'Network drive (' & $driveDetails & ') could not be mapped')

EndFunc ; _getNetworkDrive()

 

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#5 ·  Posted (edited)

Well, I guess I just needed to "verbalize" the problem...I traced the issue to another UDF include (VirtualFlex.Memory.au3 by @prazetto), which apparently is causing the SIGNIFICANT slow-down.  I only use this UDF in one place and could probably do without.  So, in the absence of time to investigate, I am going to remove that dependency.  In doing so, the BIG script now returns the _getNetworkDrive function in a few milliseconds.  I suspect the VirtualFlex.Memory.au3 UDF virtualization causes the slow-down maybe @prazetto could investigate the issue?

 

Edited by bobmcrae
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      CreationClassName|Win32_TemperatureProbe|[string]
      CurrentReading||[sint32]
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      Status|Unknown|[string]
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      Availability||[uint16]
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      ConfigManagerErrorCode||[uint32]
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      CreationClassName|Win32_TemperatureProbe|[string]
      CurrentReading||[sint32]
      Description|True Ambient Thermal Probe|[string]
      DeviceID|root\cimv2 1|[string]
      ErrorCleared||[boolean]
      ErrorDescription||[string]
      InstallDate||[datetime]
      IsLinear||[boolean]
      LastErrorCode||[uint32]
      LowerThresholdCritical||[sint32]
      LowerThresholdFatal||[sint32]
      LowerThresholdNonCritical||[sint32]
      MaxReadable|1270|[sint32]
      MinReadable|64266|[sint32]
      Name|Sensore numerico|[string]
      NominalReading||[sint32]
      NormalMax||[sint32]
      NormalMin||[sint32]
      PNPDeviceID||[string]
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      PowerManagementSupported||[boolean]
      Resolution|1000|[uint32]
      Status|Unknown|[string]
      StatusInfo||[uint16]
      SystemCreationClassName|Win32_ComputerSystem|[string]
      SystemName|DESKTOP-25LFPVU|[string]
      Tolerance|32768|[sint32]
      UpperThresholdCritical||[sint32]
      UpperThresholdFatal||[sint32]
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      Availability||[uint16]
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      ConfigManagerErrorCode||[uint32]
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      CreationClassName|Win32_TemperatureProbe|[string]
      CurrentReading||[sint32]
      Description|Memory Module Thermal Probe|[string]
      DeviceID|root\cimv2 2|[string]
      ErrorCleared||[boolean]
      ErrorDescription||[string]
      InstallDate||[datetime]
      IsLinear||[boolean]
      LastErrorCode||[uint32]
      LowerThresholdCritical||[sint32]
      LowerThresholdFatal||[sint32]
      LowerThresholdNonCritical||[sint32]
      MaxReadable|1270|[sint32]
      MinReadable|64266|[sint32]
      Name|Sensore numerico|[string]
      NominalReading||[sint32]
      NormalMax||[sint32]
      NormalMin||[sint32]
      PNPDeviceID||[string]
      PowerManagementCapabilities||[uint16]
      PowerManagementSupported||[boolean]
      Resolution|1000|[uint32]
      Status|Unknown|[string]
      StatusInfo||[uint16]
      SystemCreationClassName|Win32_ComputerSystem|[string]
      SystemName|DESKTOP-25LFPVU|[string]
      Tolerance|32768|[sint32]
      UpperThresholdCritical||[sint32]
      UpperThresholdFatal||[sint32]
      UpperThresholdNonCritical||[sint32]QUERY RESULT|# 3|/
      Accuracy|32768|[sint32]
      Availability||[uint16]
      Caption|Sensore numerico|[string]
      ConfigManagerErrorCode||[uint32]
      ConfigManagerUserConfig||[boolean]
      CreationClassName|Win32_TemperatureProbe|[string]
      CurrentReading||[sint32]
      Description|Video Card Thermal Probe|[string]
      DeviceID|root\cimv2 3|[string]
      ErrorCleared||[boolean]
      ErrorDescription||[string]
      InstallDate||[datetime]
      IsLinear||[boolean]
      LastErrorCode||[uint32]
      LowerThresholdCritical||[sint32]
      LowerThresholdFatal||[sint32]
      LowerThresholdNonCritical||[sint32]
      MaxReadable|1270|[sint32]
      MinReadable|64266|[sint32]
      Name|Sensore numerico|[string]
      NominalReading||[sint32]
      NormalMax||[sint32]
      NormalMin||[sint32]
      PNPDeviceID||[string]
      PowerManagementCapabilities||[uint16]
      PowerManagementSupported||[boolean]
      Resolution|1000|[uint32]
      Status|Unknown|[string]
      StatusInfo||[uint16]
      SystemCreationClassName|Win32_ComputerSystem|[string]
      SystemName|DESKTOP-25LFPVU|[string]
      Tolerance|32768|[sint32]
      UpperThresholdCritical||[sint32]
      UpperThresholdFatal||[sint32]
      UpperThresholdNonCritical||[sint32]
       
      Could please anyone help me out? 
      Thanks in advance
      Francesco
    • TheDcoder
      By TheDcoder
      Hello, I recently opened a bug report without reading the Helpfile... My bad . After @Melba23's gentle reminder, I was curious about why it was like that.
      It is about SetError's behaviour. This is the example from the bug report:
      Example() If @error Then ConsoleWrite("Error" & @CRLF) Else ConsoleWrite("No Error" & @CRLF) EndIf Func Example() SetError(1) Sleep(1000) EndFunc What I tried to do is set Example's (my user defined function's) @error value to 1... but the value set by SetError is cleared after calling a function, I wonder why? Why should calling to an external function effect my function's @error which is set when my function returns.
      Setting the error of a UDF in advance by using SetError makes sense... but I cannot find a reason why calling a function should clear it? Please note that I am not talking about @error, I am talking about the @error set by my function when it ends/returns!
      I hope someone can enlighten me, thanks for the answers in advance!
      P.S I tried to explain my best but my English is not very good and I didn't feel like I did a good job explaining today, so please pardon any mistakes that I have made
    • pboom
      By pboom
      I am looking for a way to retrieve filtered messages from the ‘system debug channel.' also known as  ‘kernel-mode debug output.'

      AutoIt must do the capture in real time. The following AutoIt UDF almost does what is required but it only captures application level, or Win32 debug output.

      https://www.autoitscript.com/forum/topic/82889-capture-debug-information-udf/#comment-593268

      The utility DebugView by Sysinternals captures the information as required by turning on Capture Kernal and in my case using the Filter include:

      *Incoming connection*

      The use of DebugView to do this is covered in the following tech note;

      https://www.tacticalsoftware.com/support/tech-notes/logging-com-port-activity.htm

      https://technet.microsoft.com/en-us/sysinternals/debugview.aspx

      However to make to make the information from DebugView available to my AutoIt script required DebugView capture to a text file and then my AutoIt script monitor that file for changes. The use of DebugView to capture the system debug channel could be made to work, but it was less than reliable and difficult to get started. The startup wasn’t something that could be easily automated not even with AutoIt.

      If you understood what I am talking about and made it this far, I think an explanation of the application is in order. Lots of details here sorry trying to answer questions in advance.

      I support a large installation of General Electric MUSE application. MUSE is a Windows-based medical application that processes and archives ECGs (electrocardiograms) taken on dedicated hardware (ECG Carts). Several methods exist on the cart to get the ECG from the Carts to the MUSE system; they range from floppies (on old obsolete hardware), memory cards, RS232 serial ports, and hardwired network connections.

      In our installation, we choose not to use the vendor-supplied network solution due to a variety of reasons I won’t get into here.  Instead, we have designed our own connection solution.

      We use a wireless serial server mounted on the ECG carts connecting to a server running a Serial/IP COM Port Redirector. The ECG cart and MUSE application think they are talking to each other via an RS232 port and as far as they are concerned, they are. However, this RS232 cable happens to run through our province (think State) wide Health Care WAN.  The hardware and software used can be seen on these two sites;

      http://www.bb-elec.com/Products/Wireless-Cellular/AirborneM2M-802-11-a-b-g-n-Dual-Band-Wireless/AirborneM2M-Industrial-Dual-Band-Wi-Fi-Router-Brid.aspx

      https://www.tacticalsoftware.com/virtual-serial-port-redirector/serial-ip.htm

      This setup works well we have over 130 ECG carts connecting using this setup. However, the end users are not technical, and there is a lot that can go wrong with wireless connections. So we do get complaints, often after the fact, that the ECG cart would not connect. A log of what ECG carts connected and when would be very helpful.

      The Serial redirector software can be configured to log all activity to the Kernal-mode Debug output. The serial redirector software itself being kernel level software. For configuration of the Wireless modules, we have custom written software (written in AutoIt) that amongst other things can display relevant configuration information for a Wireless module given it’s IP address.

      By extracting messages like the ones below from the Kernal-Mode Debug channel;

      COM56 : ½ Incoming connection from 10.158.188.172:51562

      COM18 : ½ Incoming connection from 10.158.188.200:50896

      COM19 : ½ Incoming connection from 10.158.188.180:59074

      COM68 : ½ Incoming connection from 142.239.15.82:34322

      We can have the module configuration program retrieve the configuration. The retrieved configuration contains more information such as the module ID number and wireless signal strength. This information is then logged to a file which is later loaded into a database. We can then query the database for connections made by a particular module within a specified time frame. The results of these Queries help us determine if the module was connected or is having problems connecting. Problems are usually indicated by poor signal strength and frequent re-connecting.

      So what I am looking for is a way for our module configuration program (written in AutoIt) to retrieve filtered Kernal-Level debug messages directly without using the DebugView application.

      The Forum post listed at the first of this message includes the source code for the DLL. So if you are versed in these matters and Visual Studio this may be an easy task. I looked at what needed to be done but, I was way over my head. If you look up the price of the serial IP redirector software, you can see that there is some money in our project for such things however, I do have a spending limit for purchases such as this.